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To determine the accuracy of CBCT devices, the absolute error rate of each parameter was calculated using micro-CT measurements as the reference value with thresholding determined by the operator. RESULTS The thresholding method performed by the operator had lower absolute error values for area, perimeter, and major and minor diameters, differing (P less then .05) from Otsu's automatic method, with no differences between the CBCT machines. CONCLUSIONS An overestimation of area, roundness, and major and minor diameters and an underestima